Subtract 7/81 from 30/28
1st number: 1 2/28, 2nd number: 7/81
30/28 - 7/81 is 1117/1134.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 81 is 2268
Next, find the equivalent fraction of both fractional numbers with denominator 2268 - For the 1st fraction, since 28 × 81 = 2268,
30/28 = 30 × 81/28 × 81 = 2430/2268 - Likewise, for the 2nd fraction, since 81 × 28 = 2268,
7/81 = 7 × 28/81 × 28 = 196/2268 - Subtract the two like fractions:
2430/2268 - 196/2268 = 2430 - 196/2268 = 2234/2268 - After reducing the fraction, the answer is 1117/1134
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/28-7/81 30/28-14/81 30/56-7/81 90/28-7/81 30/28-21/81 30/84-7/81 30/28-35/81 30/28-49/81